2BB8U-WS8408LoRa Module

WS8408 SX1262 SPI Module User Manual  Supports LoRa™ modulation  Maximum peak conducted output power is 10.5 dBm.  Supports high air data rate, up to 300 kbps  Supports data rates from 2.4 to 62.5 kbps under LoRa™ mode  Dual RF interfaces optional: U.LF connector or stamp hole.  4-wire SPI communication interface WS8408Data manual Chengdu Silent Smart Technology Co., Ltd. 2 / 12 Document information Model WS8408 Overview SX1262 SPI Module Type of documentation Data sheet Document number Document version V1.0 2023.08.29 Document version update No. Version Revised content Revised date Revised 1 v1.0 The initial version 2023.08.29 CH WS8408Data manual Chengdu Silent Smart Technology Co., Ltd. 3 / 12 1 Overview ................................................................................................................................................................................................ 4 1.1 Brief Introduction ........................................................................................................................................................................ 4 1.2 Key features ................................................................................................................................................................................. 4 1.3 Application ................................................................................................................................................................................... 4 3 Hardware design ..................................................................................................................................................................................... 5 4 Software Design ..................................................................................................................................................................................... 7 4.1 Software programming ................................................................................................................................................................ 7 5 Electrical and other parameters ............................................................................................................................................................... 7 5.1 RF performance parameters ................................................................................................................................................... 7 5.2 Other parameters .......................................................................................................................................................................... 7 6 Module packaging size ........................................................................................................................................................................... 8 7 Production instructions ........................................................................................................................................................................... 9 7.1 Reflow soldering curve graph ...................................................................................................................................................... 9 7.2 Reflow soldering temperature and time ....................................................................................................................................... 9 8 FCC STATEMENT ............................................................................................................................................................................ 10 9 Contact information ........................................................................................................................................................................... 12 WS8408Data manual Chengdu Silent Smart Technology Co., Ltd. 4 / 12 1 Overview 1.1 Brief Introduction The WS8408 is a wireless RF transceiver module designed based on Semtech's SX1262 RF chip. Utilizing the advanced LoRa™ modulation technology, this module offers lower power density and superior anti-interference performance compared to conventional FSK and GFSK modulation techniques, thereby enhancing communication reliability. Additionally, users can independently adjust the spreading bandwidth, spreading factor, and error correction rate. 1.2 Key features Key features The actual measured communication distance can reach up to 6 kilometers Supported modulation methods: LoRa TM Support frequency band: 904-926 MHz Maximum peak conducted output power is 10.5 dBm In the LoRa TM mode, it supports data transmission rates ranging from 2.4 kbps to 62.5 kbps The FIFO has a large capacity and supports a 256Byte data buffer Supported spreading factors: 5 - 12 Supported encoding rates: 4/5, 4/6, 4/7, 4/8 4-line SPI communication interface, which can be directly connected to various microcontrollers for use Wide voltage operating range: 1.8V - 3.7V(Typical voltage 3.3V) Industrial-grade standard design, capable of withstanding long-term use within the temperature range of -40°C to 85°C. Antenna Interface: IPX (U.FL) connector, matched for 50Ω external antenna Foldable antenna with maximum antenna gain is 4dBi 1.3 Application Application Home security alarm Smart Home Industrial sensor Wireless alarm security system Building Automation Solution Wireless industrial-grade remote controller Medical healthcare products Application in the automotive industry WS8408Data manual Chengdu Silent Smart Technology Co., Ltd. 5 / 12 3 Hardware design 3.1 Pin definition WS8408Data manual Chengdu Silent Smart Technology Co., Ltd. 6 / 12 Pin number Pin name Ty pe Describe 1 GND I Power reference ground 2 GND I Power reference ground 3 GND I Power reference ground 4 GND I Power reference ground 5 GND I Power reference ground 6 GND I Power reference ground 7 RXEN I RF switch receiving control pin, connected to the external microcontroller's IO, with high level as the vali…

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Bay Area Compliance Laboratories Corp. (Chengdu) Project No.: RSC260507001 Page 1 of 2 EXHIBIT B – EUT EXTERNAL PHOTOGRAPHS Bay Area Compliance Laboratories Corp. (Chengdu) Project No.: RSC260507001 Page 2 of 2 Antenna View Connected Cable

Bay Area Compliance Laboratories Corp. (Chengdu) Project No.: RSC260507001 EXHIBIT A - LABELING AND LOCATION Label Label Location

Bay Area Compliance Laboratories Corp. (Chengdu) Project No.: RSC260507001 Page 1 of 1 EXHIBIT C – EUT INTERNAL PHOTOGRAPHS

Bay Area Compliance Laboratories Corp. (Chengdu) Report Number: RSC260507001-0D Version 1.0 (2023-11-07) Page 13 of 52 QB-Report-EM-7.8-0-001 FCC §15.247(i), §1.1307(b)(3)(i) - RF EXPOSURE Applicable Standard According to §1.1307(b)(3)(i), 447498 D04 Interim General RF Exposure Guidance v01 (C) Or using Table 1 and the minimum separation distance (R in meters) from the body of a nearby person for the frequency (f in MHz) at which the source operates, the ERP (watts) is no more than the calculated value prescribed for that frequency. For the exemption in Table 1 to apply, R must be at least λ/2π, where λ is the free-space operating wavelength in meters. If the ERP of a single RF source is not easily obtained, then the available maximum time-averaged power may be used in lieu of ERP if the physical dimensions of the radiating structure(s) do not exceed the electrical length of λ/4 or if the antenna gain is less than that of a half-wave dipole (1.64 linear value). RF Exposure Evaluation Result Mode Frequency (MHz) Tune-up Conducted Power* Ant Gain* (dBi) Evaluation Distance (mm) ERP ERP Limit (mW) Exemption (dBm) (mW) (dBm) DSS 904~926 10.50 4.0 200 12.35 17.18 462.85 Compliant DTS 904~926 10.00 4.0 200 11.85 15.31 462.85 Compliant 1. Note: dBi=dBd+2.15 2. DSS and DTS doesn’t supports transmitting simultaneously. Result: The device meets the Exemption at 20cm distances.

ShenZhenXinErSheng Technology Co.,Ltd Customer Name: Recognition Product Name : 902-928MHz Foldable antenna L=200mm(±5mm) Customer Code: Manufacturer Code : ANT902-928JK20 Quantity : 2PCS produce audits authorize Sample delivery date Biao Lisen Amy 2023.06.02 Customer Recognition: recognition audits authorize Date Recognition status: ☑ New Products□ Recognition of projects Acknowledgement of items: □ Letter of acknowledgement in triplicate □ Sample 5PCS Acknowledgement of conclusions：□ Accept □ Rejected Address：3/F, Building D,N o .96Lingxia Road, Fenghuang Fourth Industrial Zone,Fuyong, Bao'an District, Shenzhen, China. Tel：0755-33881455Fax: 0755-33233276 Email: [email protected] ShenZhenXinErSheng Technology Co.,Ltd Main Technical Parameters 主要技术参数 Main technical specifications 频率范围（MHz） 902-928 Frequency Range(MHz) 902-928 中心频率 特性阻抗(Ω) 50±10 Impedance(Ω) 50±10 增益(dBi) 4 Gain(dBi) 4 反射损耗 ≤-10 ReTurn Loss(dB) ≤-10 输出电压驻波比 ≤2 VSWR ≤2 极化方式 垂直极化 Polarization Linear Vertical 连接方式 SMA内螺内孔 Connector Type RP-SMA(m)-K 物理特性 Physical Properties 天线本体材料 TPEE Antenna Base TPEE 工作温度 -45°C-+85°C Operating Temp -45°C-+85°C 保存温度 -45°C-+85°C Storage Temp -45°C-+85°C ShenZhenXinErSheng Technology Co.,Ltd Product Drawings ShenZhenXinErSheng Technology Co.,Ltd Main Technical Parameters 1. standing wave ratio (physics) 2. Smith's circle diagram ShenZhenXinErSheng Technology Co.,Ltd 2D, 3D Radiation Pattern Total (E1-XZ) ShenZhenXinErSheng Technology Co.,Ltd Photograph

Note: BACL is not responsible for the authenticity of any test data or information provided by the applicant. Test data or information included from the applicant that may affect test results are marked with an asterisk ‘*’. Do not include customer model name, addresses, names and trademarks. This report cannot be reproduced except in full, without prior written approval of the company. This report may contain data that are not covered by the NVLAP accreditation scope and shall be marked with an asterisk “◇” The report must not be used by the client to claim product certification, approval, or endorsement by NVLAP, NIST, or any agency of the U.S. Government. Version 1.0 (2023-11-07) Page 1 of 52 QB-Report-EM-7.8-0-001 FCC PART 15.247 TEST REPORT For Chengdu Silent Smart Technology Co., Ltd. 303-7, Floor 3, Building 12, No.38, South Jinke Road, Jinniu Hi-tech Industrial Park, Chengdu, Sichuan, China Report Type: Original Report Product Name: LoRa Module Report Number: RSC260507001-0D Date of Report Issue: 2026-06-18 Reviewed By: Sula Huang Test Laboratory: Bay Area Compliance Laboratories Corp. (Chengdu) No.5040, Huilongwan Plaza, No. 1, Shawan Road, Jinniu District, Chengdu, Sichuan, China Tel: +86-28-65525123 Fax: +86-28-65525125 www.baclcorp.com Tested Model: WS8408 FCC ID: 2BB8U-WS8408 Bay Area Compliance Laboratories Corp. (Chengdu) Report Number: RSC260507001-0D Version 1.0 (2023-11-07) Page 2 of 52 QB-Report-EM-7.8-0-001 TABLE OF CONTENTS GENERAL INFORMATION ........................................................................................................................................ 4 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ................................................................................ 4 OBJECTIVE .................................................................................................................................................................. 4 MEASUREMENT UNCERTAINTY ................................................................................................................................... 5 TEST METHODOLOGY ................................................................................................................................................. 5 TEST FACILITY ............................................................................................................................................................. 5 SYSTEM TEST CONFIGURATION ........................................................................................................................... 6 DESCRIPTION OF TEST CONFIGURATION* .................................................................................................................. 6 EQUIPMENT MODIFICATIONS ...................................................................................................................................... 6 EUT EXERCISE SOFTWARE* ...................................................................................................................................... 6 SUPPORT TEST DEVICES DESCRIPTION ..................................................................................................................... 7 SUPPORT TEST CABLE DESCRIPTION ........................................................................................................................ 7 BLOCK DIAGRAM OF TEST SETUP .............................................................................................................................. 7 SUMMARY OF TEST RESULTS ............................................................................................................................. 10 TEST EQUIPMENTS LIST ........................................................................................................................................ 11 FCC §15.247(i), §1.1307(b)(3)(i) - RF EXPOSURE ............................................................................................. 13 APPLICABLE STANDARD ............................................................................................................................................ 13 RF EXPOSURE EVALUATION RESULT ....................................................................................................................... 13 FCC §15.203 - ANTENNA REQUIREMENT .......................................................................................................... 14 APPLICABLE STANDARD ............................................................................................................................................ 14 ANTENNA INFORMATION* .......................................................................................................................................... 14 FCC §15.207 (a) – AC LINE CONDUCTED EMISSIONS ................................................................................... 15 APPLICABLE STANDARD ............................................................................................................................................ 15 EUT SETUP ............................................................................................................................................................... 15 EMI TEST RECEIVER SETUP .................................................................................................................................... 15 TEST PROCEDURE .................................................................................................................................................... 16 CORRECTED AMPLITUDE & MARGIN CALCULATION ................................................................................................. 16 TEST DATA ................................................................................................................................................................ 16 FCC §15.209, §15.205 & §15.247(d) - RADIATED SPURIOUS EMISSIONS & BAND EDGE .................... 19 APPLICABLE STANDAR…

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Bay Area Compliance Laboratories Corp. (Chengdu) Project No.: RSC260507001 Page 1 of 4 EXHIBIT D - TEST SETUP PHOTOGRAPHS Conducted Emission Setup Front View Conducted Emission Setup Side View Bay Area Compliance Laboratories Corp. (Chengdu) Project No.: RSC260507001 Page 2 of 4 Radiated Emission Setup Front View (9kHz-30MHz) Radiated Emission Setup Rear View (9kHz-30MHz) Bay Area Compliance Laboratories Corp. (Chengdu) Project No.: RSC260507001 Page 3 of 4 Radiated Emission Setup Front View (30MHz-1GHz) Radiated Emission Setup Rear View (30MHz-1GHz) Bay Area Compliance Laboratories Corp. (Chengdu) Project No.: RSC260507001 Page 4 of 4 Radiated Emission Setup View (1GHz-10GHz) Conduted Measurement Setup View